Exam 1 Review. MATH Intuitive Calculus Fall Name:. Show your reasoning. Use standard notation correctly.
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1 MATH Intuitive Calculus Fall 2012 Name:. Exam 1 Review Show your reasoning. Use standard notation correctly. 1. Consider the function f depicted below. y 1 1 x (a) Find each of the following (or state does not exist ). x 3 x 1 x 2 x 4 x 3 + x 1 + x 2 + x 4 + x 3 x 1 x 2 x 4 f( 3) = f( 1) = f(2) = f(4) = (b) Answer Yes or No. (This refers to the function depicted above.) i. Is f continuous at x = 3? v. Is f differentiable at x = 3? ii. Is f continuous at x = 1? vi. Is f differentiable at x = 1? iii. Is f continuous at x = 2? vii. Is f differentiable at x = 2? iv. Is f continuous at x = 4? viii. Is f differentiable at x = 4? (c) True or False: For a function f, the value of lim x a f(x) depends upon the value of f(a). 1
2 2. Let f be a differentiable function of the variable x. (a) Give the mathematical expression which represents the y-coordinate on the graph y = f(x) at the point where x = 17. (b) Give the mathematical expression which represents the slope of the line tangent to the curve y = f(x) at the point where x = 17. (c) What equation would you solve to find the x-coordinates of all points on the curve y = f(x) whose y-coordinates are 32? (d) What equation would you solve to find the x-coordinates of all points at which the line tangent to the curve y = f(x) has slope 5? (e) What equation would you solve to find the x-coordinates of all points at which the y-coordinate is equal to the slope of the line tangent to the curve y = f(x)? 3. Give all possible meanings of each mathematical expression from the list below. You may use each letter any number of times. Mathematical Expression Meaning(s) (list by letter) f(a) f(a + h) f(a) h f(a + h) f(a) lim h 0 h f (a) Possible Meanings: (a) the slope of a tangent line to the graph y = f(x) (b) the y-coordinate of a point on the graph y = f(x) (c) the average rate of change of f with respect to x (d) the slope of a secant line to the graph y = f(x) (e) the instantaneous rate of change of f with respect to x (f) an output of the function f 2
3 4. Find and simplify the derivative, f (x), for the function f given. Use the definition of the derivative (the limit of the difference quotient). Start with the general formula and show all steps. f(x) = 3x 2 10x + 45 f (x) = 5. Find an equation of the line tangent to the graph of the function f(x) = x 3 x 2 x + 5 at the point where x = 2 by following the given steps. (a) Find the y-coordinate of the point on the curve y = f(x) where x = 2. (b) Find the derivative f (x). You may use short-cuts. (c) Find the slope m of the tangent to the curve y = f(x) at the point where x = 2. (d) Find an equation of the tangent to the curve y = f(x) at the point where x = 2. Write it in the form y = mx + b. (e) Find the x-coordinates of all points on the graph y = f(x) for which the tangent line is horizontal. 3
4 6. Let f be a differentiable function and c a real constant. Use the definition of derivative to prove that (cf) (x) = c f (x). 7. Let f and g be differentiable functions. Use the definition of derivative to prove that (f g) (x) = f (x) g (x). 4
5 8. Label each of the following on the graph of f below. (a) the point (x, f(x)) (b) the point (x + x, f(x + x)) (c) a secant line (d) a tangent line (e) a line segment with length dx (= x) (f) a line segment with length f(x) (g) a line segment with length dy (h) a line segment with length y y=f(x) x x+ x In this example, is the error in the approximation y dy large or small? Explain. 9. A widget company s cost function is C(x) = x 0.5x 2 dollars. (a) Find the cost of producing one widget. (b) Find the cost of producing 20 widgets. (c) Find the cost of producing 21 widgets. (d) Find the cost of producing the 21st widget. (e) Find the marginal cost function. continued on next page 5
6 (f) Find the marginal cost at x = 20 and explain what it represents (in plain English). (g) For y = C(x), find a formula for the differential dy. (h) If x = 20 and dx = x = 1, find dy and explain what it represents (in plain English). (i) If x = 20 and dx = x = 1, find y and explain what it represents (in plain English). 10. Let C(x) be cost, R(x) be revenue, and P (x) be profit, all in dollars, of producing x DVD players. Suppose that C(1000) = 150, 000, C (1000) = 45, R(1000) = 175, 000, and R (1000) = 40. (a) Evaluate each of the following, showing your reasoning. Then interpret in a complete sentence in plain English (in terms of DVD players and dollars). Do not use the terms derivative or marginal in your interpretation. i. P (1000) = ii. P (1000) = (b) If the company wishes to increase its profits, should it increase or decrease the production level or let it remain at 1000? Why? 6
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